The 2013-14 Seahawks finished the year with a 13-3 record, a +186 point differential, and +40.1…
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"They look at it and say, 'We may get called for one but not 10,'" said Mike Pereira, a former NFL vice president of officiating who is now a Fox analyst.

It's even more devious than that. No one knows what a catch is in the NFL anymore, and with changing and complex rules, no one knows what constitutes a penalty either. It varies from week to week, official to official, and the Seahawks seem able and willing to take advantage of that. From a Seattle Times story in October:

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Seattle defensive coordinator Dan Quinn said the calls so far are not a huge cause for concern, other than making sure the players remain aware of how the games are being officiated.

"It's nothing that we get too wrapped up in," he said. "The thing we try to do is just educate what's going on around the league, in terms of, 'This was called in this game. This was called in this game.' ... [F]or us, it's important just to know what's kind of the climate of how it's being called."

How do you figure that out? Easy enough. Mug receivers early on and see where the line is. In the WSJ piece, Pereira says the Seahawks "test" referees early in the game "to see what kind of tone the officials are going to set."

This isn't evil, it's genius. Seattle knows that even if it fouls on every play, officials know they'd be the ones to catch hell for throwing too many flags. Football's always been about doing whatever you can get away with—you can find offensive lineman holding on just about every play—and you can get away with an awful lot more in the playoffs than you can in the regular season. So, good luck, Saints.